Materials Literature
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2-Dicyanomethylene-1,1,3,4,5,5-hexacyanopentene (DHCP) dianion, which had been reported as 2,3-bis(dicyanomethyl)-1,1,4,4-tetracyanobutadiene, was synthesized as a tetraalkylammonium salt from hexacyanobutadiene. The crystal structures of tetraalkylammonium (alkyl: methyl, ethyl), tetrathiafulvalene (TTF) and bisethyl…
This paper provides an overview of the current fiber world in terms of consumption of various fiber types worldwide. Further, it deals with the development of our modern concepts of fiber structure based on the original theories for natural cellulosic fibers. As an example of modern fiber science research, the paper c…
The formation of the microdroplets on fibres for the MDT test offers an opportunity to carry out surface tension measurements based on the angle of contact between the resin and the fibre. Liquid microdroplets of epoxy were deposited on glass fibres, and their diameter, length and cone angle were measured. The equilib…
Poly(imide-siloxane) containing α,ω-(aminophenoxypropyl)poly(dimethylsiloxane) and α,ω-(aminophenoxypropyl)poly(dimethylsiloxane-co-diphenylsiloxane) were synthesized. The adhesion strength of poly(imide-siloxane)/Alloy 42 leadframe (Fe-Ni alloy, 58% Fe and 42% Ni) joints was studied as a function of the molding tempe…
The paper presents results of the study of the dependence of longitudinal ultrasonic velocity and attenuation in ferroelectric-semiconductor single crystals of the Sn2P2(Se,S)6 family on temperature. A photostimulated shift of the phase transition to lower temperature has been detected. Oscillations of relaxing ultras…
In a pot experiment with five harvests of ryegrass the potassium (K) uptake from soil was studied in a clay and a silt soil, with (K1) and without (K0) K fertilizer. Ammonium acetate lactate-extractable K (K-AL) was rapidly depleted, and in K0 the K-AL level stabilized at 30 and 100 mg K kg -1 in the silt and clay soi…
Disposable gloves made from polyvinyl chloride with and without di(2-ethylhexyl) phthalate (PVC-DEHP, PVC-NP), polyethylene (PE), natural rubber (NR) and nitrile-butadiene rubber (NBR) were investigated with respect to evaporation residue, migrated metals, migrants and residual acrylonitrile. The evaporation residue f…
The main objective of this paper is to summarize CEA data recently obtained on different kinds of steels irradiated at 325°C in the Osiris experimental reactor in a typical PWR environment, that is, pressurized water — P=155 bars — with controlled PWR type chemistry. The different steels studied can be classified in f…
Chitosan (β-(l,4)-2-amino-2-deoxy-D-glucose) is a naturally occurring, abundant biopolymer exhibiting desirable biomaterial properties of biodegradability, low toxicity and good biocompatibility. These properties indicate the suitability of chitosan as a surface for mammalian cell growth. The goal of this thesis is to…
Silicon nanoparticles with diameters ranging from 3 to 50 nm were prepared by thermal evaporation. The nanoparticles showed visible light emissions from 5000 A to 9000 A, with peak intensity at 8000-8200 A, when excited with a He-Cd laser. The intensity increased with decreasing particle size. Based on the photolumine…
We encapsulate a number of fullerenes inside single-walled carbon nanotubes (SWNTs) including C60, La2@C80 and ErxSc3−xN@C80(x=0–3). In addition, a number of metallocenes are seen to form hybrid structures with SWNTs, filling the lumen. Ferrocene is used to show that a particular molecule can be induced to fill the lu…
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The dissolution behaviour of two types of fibres, the biosoluble HT and the traditional MMVF21 stone wool fibres, in synthetic simulated lung fluid (Gamble's solution) at pH 4.5 was investigated in order to clarify the mechanisms, and the effect of the various constituents in the liquid. The Gamble's solution contains…
A new type of semiconductor thermoelectric generator is put forward. The efficiency and power output are taken as objective functions and used to analyze the performance characteristics of the generator. The maximum efficiency and power output of the generator are calculated for different cases. The internal structure…
Knoop hardness and the shrinkage behavior of Knoop indentation were investigated for zinc tellurite glasses. A minimum in Knoop hardness was observed at around the composition of 20ZnO⋅80TeO2. This anomalous compositional dependence originated from a decrease in coordination number of both Te and Zn with increasing in…
This paper deals with the development of the crystal growth rate model according to a novel modelling strategy. The method combines an artificial neural network (ANN) as an approximator of the growth rate with prior knowledge represented by the mass balance on sucrose crystals. This approach reduces the modelling effo…
A comprehensive knowledge of the nature and origin of dielectric polarization and electrical conduction in viscoelastic polymers requires considerations of multiplicity of interactions of the polymer chains and their fine structure behavior. Molecular motions in polymers involve the concept of 'reptation' in which a p…
The influence of fibre, yarn, and fabric properties on the bagging behaviour of woven fabrics is studied by developing rheological models and comparing them with the results of statistical analysis on experimental measurements. Three rheological models are developed to describe the bagging-deformation features at diff…
A series of polyurethane/PMMA simultaneous interpenetrating networks (SINs) with various hard segment contents (X) in the polyurethane phase (X = 15.5 to 36.5% in polyurethane) and wide range of polyurethane (PU) to polyacrylate (PA) ratio (PU/PA = 20:80 to 80:20) were prepared, and the damping and mechanical properti…
A process was developed for the microencapsulation of inorganic filler particles with poly-methyl-methacrylate, to increase the interaction between the hydrophilic filler particles and a polymer matrix. The filler utilised was aluminium hydroxide with an average diameter of 1.9 microm and a specific surface area of 5…